DJI Agras T40 Ball Seal Spring (5 Pcs) Replenishment (Monthly Program)

DJI Agras T40 Ball Seal Spring | Spray Nozzle Check Valve Spring | 5-Piece Genuine OEM Pack | Monthly Replenishment Program

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🇺🇸 U.S.A. FIRST

Ares Acres LLC is a U.S.-based authorized DJI Agras reseller supporting American agricultural drone operators with genuine DJI Agras OEM replacement parts, accessories, and field-ready inventory.

FREE & FAST Shipping is included for all U.S. customers.

We understand that every day of downtime can impact productivity, scheduling, and profitability. That's why we focus on providing fast fulfillment, responsive customer support, and reliable access to the parts operators need most.

Inside every T40 spray nozzle check valve sits a small spring holding the check-valve ball seated against the seal so the nozzle snaps shut the instant the pump stops. When springs fatigue, nozzles keep dripping after shutoff — chemical landing where it was never meant to go. They fatigue with every pressurization cycle while pesticide and fertilizer chemistry attacks them, and T40 fleets replace them nozzle by nozzle all season long.

That is the economics this program exists to fix. Instead of paying the one-time 5-pack price mid-season while nozzles drip, a fresh pack of 5 genuine DJI OEM ball seal springs ships automatically every month for a recurring monthly program fee — not a one-time purchase price.

Every spring is yours to keep, there is no minimum term, cancel anytime, and free U.S. shipping is included on every cycle.

Enroll using the purchase option above — current pricing is shown there. Cancel anytime.

For professional farmers, aerial applicators, and commercial drone operators, this program is nozzle discipline on autopilot.

We use specialized technicians to verify and dispatch the Ball Seal Spring (5 Pcs) Replenishment ordered.

Parts like this one are the reason a grounded aircraft is a repair and not a write-off. A single component held in U.S. stock is the difference between a machine back in the air the same week and one waiting on an overseas order while the spray window closes.

That is why Ares Acres keeps hard-to-find OEM seals & vent hardware in stock and shipped fast within the U.S.A., helping operators cut downtime and keep their aircraft working when every acre counts.

For professional farmers, aerial applicators, and commercial drone operators running the DJI Agras T40, this is the part that keeps a scheduled job on the calendar instead of on hold.

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✅ DJI Agras T40 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking

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📦 Package Includes

• 1 × pack of 5 genuine DJI Agras T40 OEM Ball Seal Springs — shipped automatically every month
• OEM protective packaging on every cycle
• Recurring monthly program fee billed at the price shown above — not a one-time purchase price
• Every spring delivered is yours to keep
• No minimum term — cancel anytime and keep everything already shipped
• FREE U.S. shipping with tracking on every shipment
• Enrollment through the purchase option above — current pricing is shown there

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🔧 Component Overview

The DJI Agras T40 Ball Seal Spring is the genuine DJI OEM spring inside the T40's spray nozzle check valves, keeping the ball pressed against its seal so the nozzle opens cleanly under pressure and closes completely the moment pressure drops.

The ball seal spring provides:

• Positive ball seating against the seal
• Instant nozzle shutoff when the pump stops
• Drip-free line holding between passes
• Clean spray starts on each swath
• Consistent valve opening pressure
• Uniform application nozzle to nozzle
• Protection against uncontrolled dribble

Commercial agricultural drones cycle hard every day, including through:

• Crop spraying missions
• High-tempo fill-and-fly cycles
• Pump start-stop cycling at every headland turn
• Long-duration spraying campaigns
• Multi-aircraft fleet operations
• High-acreage contract work

Throughout these operations, ball seal springs are routinely exposed to:

• Fatigue loading on every pressurization cycle
• Pesticide chemistry attacking the metal
• Fertilizer solutions and corrosive tank mixes
• Adjuvants and surfactant blends
• Abrasive particles in the spray solution
• Pressure spikes at pump start
• Cleaning and flushing chemicals

A fresh, full-tension spring helps maintain:

• Nozzles that seal completely at shutoff
• Drip-free headland turns and hovers
• Even application across the boom
• Chemical staying where it was prescribed
• Crops protected from stray dribble
• Maximum aircraft uptime

For operators applying chemistry over paying acreage, fresh springs are non-negotiable.

Before replacing anything, find out whether the drip is the spring or the seat it closes against. Park the aircraft level with liquid still in the tank and the system unpressurized, wipe each nozzle dry, and lay clean dry cardboard under it. Static head from the tank alone should not get past a healthy check valve. A nozzle that puts a wet ring on the cardboard while nothing is running has a valve that is not sealing, and now you know which position to open.

That test tells you which nozzle, not which part, and a swap answers the rest in five minutes. Move the suspect spring into a position that stayed dry, put that position's spring into the leaker, and repeat the static test. If the leak follows the spring, the spring has lost preload or taken a permanent set. If the leak stays with the position, the ball, the seat, or the sealing face is damaged and a new spring will not fix it.

Compare removed springs against a new one on the bench rather than by feel. Stand them upright side by side on the same flat surface and sight across the tops; a spring that has taken a set sits visibly lower. Then compress each one between finger and thumb against the new one and watch the effort before the coils close up. Loss of preload is obvious in that comparison. A spring that stands full height and still resists properly points you at the seat instead.

Look for what is holding the ball off its seat besides a tired spring. One grain of grit, a flake of dried tank mix, or a fertilizer crystal grown between the coils will hold a valve open with a sound spring in it. Roll the ball across a clean flat surface and watch for a wobble or a dull band where it has been seating. Run a fingernail around the seat. A groove you can feel is a leak path no amount of spring pressure will close.

Timing separates a real leak from normal drain down. After shutoff the liquid standing in the line above a nozzle has to go somewhere, and a few seconds of run off is not a fault. A fault is a nozzle still releasing liquid minutes later while the machine sits, or one that drips harder the fuller the tank is. Weeping that tracks tank level is preload no longer strong enough to hold back the head of liquid above it.

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⚙️ Functional Purpose

The ball seal spring makes the T40's check valves decisive: fully open under pressure, fully closed without it. The program keeps the springs doing that job from ever being past their prime.

The program helps:

• Hold the check-valve ball seated against the seal
• Shut nozzles off instantly when the pump stops
• Prevent post-shutoff dripping and dribble
• Maintain uniform application across every nozzle
• Prevent chemical waste between passes
• Reduce crop-damage risk from dribble
• Replace fatigued springs before they leak
• Keep a rolling spring stock in your inventory
• Turn a season-long consumable into automatic delivery
• Keep aircraft spraying when every acre counts

Worn or fatigued ball seal springs may contribute to:

• Nozzles dripping after pump shutoff
• Uneven application across the boom
• Chemical waste between passes
• Crop damage from uncontrolled dribble
• Streaking and inconsistent coverage
• Inaccurate application-rate accounting
• Interrupted missions for nozzle service

Fresh springs restore the instant shutoff the system was engineered around.

Flush before you open anything. Run clean water through the spray system until it runs clear, relieve pressure, and drain, because what stands inside a closed check valve is concentrated product and you are about to put your hands in it. Gloves and eye protection are not optional here, and the rinse water goes in a container, not on the yard where the aircraft parks.

Work over a tray or a folded shop towel, never over grass, gravel, or an open floor drain. A check ball and its spring are among the smallest loose parts on the aircraft and both launch the moment a retainer releases. Lay the pieces out left to right in the order they came apart and photograph the stack before disturbing the last one. Which end of the spring bore against the ball is not obvious once it is loose in a tray.

Many valve springs have one end ground closed and square and the other left open, and the closed end is what pushes the ball evenly instead of cocking it. Put the new spring in the way the old one came out. If both ends genuinely look alike, note that in your photo and stop worrying about it, but do not guess after the fact. A spring sitting cocked against the bore wall seats the ball off center and weeps from the first pressure cycle.

Clean the bore and the seat before the new spring goes in. A cotton swab and clean water lift most dried residue; anything needing more should be worked with something softer than the seat, never a screwdriver or a pick. Dry it. Fit the ball, then the spring, then start the retainer by hand, turning it backward until you feel the thread drop in before turning forward. These are fine threads in small parts, and cross-threading one turns a five minute job into a nozzle body order.

Confirm the refit with clean water before chemical goes back in the tank. Pressurize and watch each nozzle at shutoff: a properly seated valve stops with a clean break rather than trailing off, and the outside of the body stays dry. Then repeat the static test with the pump off. If one position still weeps, the spring was never the fault, and you found that out in the yard instead of over a paying field.

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⚠️ Common Replacement Indicators

Spring replacement may be recommended when operators observe:

• Nozzles dripping or weeping after pump shutoff
• Dribble continuing in transit between fields
• Wet spots or streaks under the hover path
• Uneven spray pattern across the boom
• Nozzles slow to shut off or open
• Residue accumulating on nozzle bodies and booms
• Tank volume not matching acres applied
• Corrosion or discoloration on removed springs
• Springs shorter or softer than new ones
• High-hour seasons with no spring rotation yet

Common causes of wear include metal fatigue from every pressurization cycle, corrosive pesticide and fertilizer chemistry, abrasive spray solutions, and pressure spikes at pump start — which is why disciplined fleets replace on schedule instead of on failure.

One nozzle drips and the rest stay dry. That is a fault at that position, not a system fault, and the order of likelihood is a spring that has lost preload, then debris trapped under the ball, then a scored ball or seat. Swap that spring with one from a dry position before ordering anything, because the swap tells you which of the three you have.

Every nozzle drips and they all started at once. Springs do not fatigue on the same afternoon. Something changed system wide: pressure not bleeding down at shutoff, a check upstream holding the system charged, or a tank vent condition setting up a siphon. Fresh springs mask that for a while and then it returns. Find the system cause first and change springs on their normal rotation.

The drip worsens as the tank fills and eases as it empties. That is close to a signature for a fatigued spring rather than a damaged seat, because it is static head beating preload. A seat that is cut or grooved tends to leak at any tank level. A weak spring leaks in proportion to the weight of liquid sitting above it.

A nozzle is slow to come up to pattern at the start of a pass and then behaves normally. That is usually a spring binding rather than one that is weak: fertilizer crystallized between the coils, or a coil pulled out of line and catching in the bore. It presents as a flow problem and it is a mechanical one, which is why operators chase pumps and filters over it for weeks.

One nozzle spits or pulses at low application rates and runs steady at high rates. The valve is chattering, opening and closing around a cracking point the system is sitting right on top of. A spring whose preload has drifted moves that point, and the nozzle that chatters at low rate is usually the one whose spring is furthest from new.

A wet stripe down the arm below one nozzle after a transit leg, or a crust of dried product building on that body while the others stay clean, is a chronic weeper you have not caught yet. Wash it off and look again after a day of work. If it comes back in the same place, that valve is releasing product every time the machine sits.

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📐 Specifications

Component Type: Spray nozzle check-valve ball seal spring — 5-piece pack, monthly replenishment program

Compatibility:

• DJI Agras T40

Package Quantity: 5 springs per monthly shipment

Installation Area: Inside the spray nozzle check valves

Function: Holds the check-valve ball seated for instant, drip-free nozzle shutoff

Construction: Genuine DJI OEM replacement spring

Condition: Brand new on every cycle

Program Structure: Recurring monthly program fee billed at the price shown above, not a one-time purchase price. A fresh 5-pack ships automatically every month; no minimum term; cancel anytime; all parts are yours to keep.

Fulfillment: Ships from the United States, free with tracking, every cycle

Product Classification: Seals & Vent Hardware

Spring Free Length, Wire Diameter, and Rate: Not published in this listing. Springs that look alike across the Agras range differ in these dimensions, and that difference sets when the valve opens and how hard it closes. Match the DJI material number, or set the removed spring beside the new one before it goes in.

Valve Cracking and Reseat Pressure: Not published here. It is a product of spring rate, preload, and ball and seat geometry rather than a value you set on the aircraft. Do not attempt to adjust it by stretching, shimming, or trimming a spring.

Replacement Interval in Hours: No hour figure is published for this spring, and a number quoted without a source is a guess. Replace on evidence: a static leak test at each position, a side by side height comparison against a new spring, and visible corrosion or pitting on the wire.

Nozzle Positions Covered by One Pack: Each shipment contains 5 springs. Count the check valve positions on your own aircraft and spray configuration before assuming one pack covers a full set, and decide whether you are rotating position by position or changing every position at once.

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🧰 Fitment Verification Before You Order

Confirm fitment by part number before ordering. Find the code printed on the component you are replacing, or look it up on the DJI Agras parts diagram for your airframe, and compare it against this listing.

Revision suffixes are still the same part. DJI labels sometimes carry a trailing revision such as .01, .02, or .F. Those denote a production revision, not a different component. Match the base number and disregard the suffix.

Visually similar is not the same. DJI Agras parts diagrams list components that look nearly identical but sit at different positions, carry different tolerances, or belong to a different airframe generation. Ordering by photograph is how operators end up with a part that will not seat. Order by number.

Verified fitment for this listing: DJI Agras T40. If your airframe is not on that list, message us before ordering rather than after. We would rather answer a question than process a return, and so would you.

Not sure? Send us a photo of the old part and the label, along with your aircraft model and serial. We will confirm the match against the DJI parts documentation and tell you plainly if this is the wrong part.

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🛠️ Installation & Handling Notes

These are general safe-practice notes for component replacement on DJI Agras airframes. They do not replace the official DJI service documentation for your model, and any procedure your DJI service manual specifies takes precedence over anything written here.

Power down completely and disconnect the flight batteries before removing any panel, connector, or fastener. Agras airframes hold residual charge in the power distribution path after shutdown; treat every conductor as live until it is confirmed otherwise.

Photograph the assembly before you disturb it. Cable routing, connector orientation, and fastener lengths on Agras airframes are not interchangeable, and the Ball Seal Spring (5 Pcs) Replenishment is easier to fit correctly when you can see how the original sat.

Torque to DJI specification. Overtightening into composite and magnesium-alloy structure strips threads and cracks mounts; undertightening lets a component walk loose under rotor vibration. Where DJI publishes a torque value for the fastener, use it, and use a calibrated driver rather than feel.

Check the mating surfaces and seals while you are in there. A component is only as good as what it seats against. Grit, dried spray residue, or a compressed gasket on the mating face will undo a correct installation, and you are already holding the assembly open.

Test before you spray. Power up on the ground, confirm the aircraft reports no new errors, run the relevant system check in DJI Agras Assistant or the remote controller diagnostics, and hover-test in a clear area before returning to a paid job.

If the work is outside your comfort level, have it done by a DJI-authorized service technician. The part cost is small next to the airframe.

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🚜 Necessary For

This program is ideal for:

• DJI Agras T40 operators
• Farmers operating spray drones
• Commercial spraying contractors
• Aerial applicators working booked acreage
• Fleet maintenance managers
• Agricultural drone technicians
• Commercial drone fleets
• Precision agriculture businesses
• Preventative maintenance programs

Especially valuable during:

• Spring spraying season
• Summer application windows
• Peak-season nozzle service
• High-acreage contract pushes
• Multi-aircraft fleet maintenance
• High-hour commercial operations

When a nozzle starts weeping over a paying field, springs on the shelf keep operations moving.

The part most often ordered by mistake instead of this one is the seal the ball closes against. Both live inside the same valve, both get blamed for the same drip, and on a parts diagram they sit side by side. On the bench they are unmistakable: the spring is the coiled wire that pushes, the seal is the soft face that stops. If the removed spring stands full height beside a new one and still leaked, the seal is your repair.

Small springs elsewhere on the aircraft are close enough in size to cause trouble once loose in a parts tray. Tank cap and vent hardware, quick release couplings, and filter housings all carry coil springs in the same general range. After they are mixed, the only honest way to sort them is by where they came from and by comparison against a known new part. Bag pulled springs by position rather than dropping them in a common tin.

Springs from other Agras generations are the other trap. A nozzle spring from a different airframe can look indistinguishable from this one across a workbench and still carry a different free length or wire size, which shifts when the valve cracks and how firmly it reseats. This listing is supplied for the DJI Agras T40. Order by DJI material number against your own parts diagram rather than by photograph or memory.

Replace by set rather than one at a time wherever the schedule allows. A machine running a mix of new and fatigued springs opens unevenly at ramp up, because each valve cracks at whatever its own spring will allow, and that shows in the pattern before it shows as a drip. The reason this program ships a pack rather than a single spring is that uniform preload across positions is what keeps application even.

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💡 Why This Part Matters

A spray drone's value proposition is putting chemical exactly where it belongs and nowhere else. The ball seal spring is one of the smallest parts on the T40, but it guards exactly that line: the difference between a nozzle that shuts off and a nozzle that keeps dribbling.

The replenishment program turns that risk into a routine: a fresh 5-pack arrives every month, the parts are yours to keep, and worn springs come out on your schedule.

Fresh ball seal springs help maintain:

• Instant, complete nozzle shutoff
• Drip-free turns, hovers, and transits
• Even, accurate application across the boom
• Chemical budgets that survive the season
• Crops protected from stray dribble

Without a spring supply on the shelf, operators risk:

• Nozzles dripping through the weeks that pay
• Chemical wasted between every pass
• Crop-damage claims from uncontrolled dribble
• Emergency orders for a consumable part
• Lost spraying opportunities

Protect the spring. Protect the nozzle. Protect the mission. Protect the season.

Application quality is reputation. Fresh OEM springs every month means every nozzle shuts off like it should, all season.

While the valve is open, look at everything sharing its environment. Check the ball for a dull seating band or a flat, the seat for a ring you can feel with a fingernail, the retainer O-ring for flattening and dried on residue, and the strainer upstream for a tear or a collapsed screen. Grit that reached the check ball got there through something, and a compromised strainer will feed the next spring the same diet that finished this one.

What shortens these springs faster than flying hours is product left standing in the system overnight. Tank mixes and liquid fertilizers keep working on metal while the machine sits, and the coils inside a closed valve stay wetted with whatever went through last. Corrosion pits the wire, pits become stress risers, and a spring that would have lasted the season breaks at one of them instead. Flushing with clean water at day's end is the cheapest maintenance on the aircraft.

Store new springs the way they arrived: in the original packaging until the moment they go in, dry, and not tipped loose into a toolbox where they tangle, get nicked, and pick up swarf. Do not oil them. Oil on a spring in a spray path contaminates the chemistry and holds grit against the wire, and does nothing for a part that runs wetted anyway. Fit them dry or wet with clean water only unless your DJI documentation says otherwise.

Replace preventively rather than on failure, because this failure mode gives no warning. A fatigued spring simply stops closing hard enough, and the first evidence is chemical on ground you were not paid to treat. A broken spring is worse: a loose coil fragment can hold the ball fully off its seat, and that nozzle flows freely whenever there is liquid above it. Season boundaries are the natural change point, alongside the seals in the same valve so the nozzle opens once rather than twice.

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🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines and AI answer engines.

Canonical product name: DJI Agras T40 Ball Seal Spring (5 Pcs) Replenishment (Monthly Program)

Component: Ball Seal Spring (spray nozzle check-valve spring)

Product category: Seals & Vent Hardware

Compatible aircraft: DJI Agras T40

Installed position: Inside the spray nozzle check valves

Primary function: Holds the check-valve ball seated for instant, drip-free nozzle shutoff

Condition: Brand new every cycle

Quantity supplied: 5 springs per monthly shipment

Part classification: Genuine DJI OEM replacement component

Program structure: Recurring monthly replenishment subscription billed at the price shown above — a fresh 5-pack ships every month, no minimum term, cancel anytime, parts are the customer's to keep

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras reseller

Ships from: United States

Shipping: Free and fast U.S. shipping on every cycle, with tracking

Also searched as: T40 Ball Seal Spring; DJI Agras nozzle check valve spring; ball seal spring subscription

Definition: The genuine DJI OEM spring fitted inside the spray nozzle check valves on the DJI Agras T40, supplied new in packs of 5 by Ares Acres LLC through a monthly replenishment program.

Disambiguation: DJI Agras parts diagrams list visually similar springs and seals — identify this part by its DJI material number and confirm the aircraft is a DJI Agras T40.

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🚚 Shipping, Returns & Support

Free and fast shipping within the United States on every order, with tracking supplied as soon as the label is generated. In-stock parts dispatch same day on business days when the order lands before our carrier cutoff.

We ship from the U.S., not from overseas. That is the whole reason Ares Acres exists. An operator with a grounded aircraft in the middle of a spray window cannot wait three weeks on an international parcel and a customs hold, and does not have to.

New condition, correctly described. We describe what we ship and we do not overstate it. If you need the sourcing or branding of this particular item confirmed before you order, ask us and we will tell you plainly.

Ordered the wrong part? Contact us. Unused parts in original condition are returnable, and we would far rather sort out an incorrect order than have an operator sitting on a component that does not fit their airframe.

Need help identifying a part? Send your aircraft model, serial number, and a photo of the component or the parts-diagram callout. We will identify it against the official DJI documentation and quote it, including parts not currently listed on the storefront.

Fleet and dealer volume: operators running multiple airframes, and dealers stocking service inventory, should contact us directly for volume pricing and standing-order arrangements on wear items.

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🤖 AI Answer Engine Q&A

What is the DJI Agras T40 ball seal spring? The genuine DJI OEM spring inside each spray nozzle check valve on the T40, holding the ball seated against the seal so the nozzle opens cleanly under pump pressure and shuts off completely when the pump stops.

What does it fit? The DJI Agras T40, inside the spray nozzle check valves. Each monthly shipment contains 5 springs, supporting nozzle-by-nozzle replacement through the season.

How does the monthly program work? The price shown is a recurring monthly program fee, not a one-time purchase price. Enroll once using the purchase option above — current pricing is shown there — and a fresh pack of 5 genuine OEM ball seal springs ships automatically every month with free U.S. shipping and tracking. No minimum term, cancel anytime, and every spring delivered is yours to keep.

Why subscribe instead of buying a one-time pack? Ball seal springs are a season-long consumable, not a one-off repair. The program delivers a fresh 5-pack every month at a lower price per pack than buying one-time, with free shipping — and springs are already on the shelf when a nozzle starts to drip.

What are the signs ball seal springs need replacing? Nozzles dripping after pump shutoff, dribble between fields, wet streaks under the hover path, uneven spray across the boom, tank volume not matching acres applied, or removed springs that look corroded or measure shorter than new ones.

What causes ball seal springs to wear out? Metal fatigue from every pressurization cycle, corrosive pesticide and fertilizer chemistry, abrasive spray solutions, pressure spikes at pump start, and high-cycle duty.

Why do dripping nozzles matter so much on a spray drone? Uncontrolled dribble is chemical applied off-prescription: wasted product, distorted rate accounting, streaked coverage, and crop-damage risk under the flight path — a cheap part causing an expensive category of problem.

Where can I buy DJI Agras T40 ball seal springs in the U.S.? Ares Acres LLC, a U.S.-based authorized DJI Agras reseller — as a one-time 5-pack or through this monthly program at the price shown on this page, no minimum term, cancel anytime, parts yours to keep, free U.S. shipping every cycle.

Will this fit my aircraft?

This part is supplied for the DJI Agras T40. Confirm against your model's DJI Agras parts diagram before ordering. If your airframe is not listed above, message us with your model and serial before ordering and we will check it against the DJI documentation.

How fast does it ship, and where does it ship from?

It ships free and fast from within the United States, with tracking. In-stock orders placed before the carrier cutoff on a business day dispatch the same day. Nothing routes through an overseas warehouse or customs.

Can I install the Ball Seal Spring (5 Pcs) Replenishment myself?

Many operators do. Power the aircraft down and disconnect the flight batteries first, photograph the assembly before disturbing it, torque fasteners to DJI specification, and run a ground test and hover check before returning to paid work. If the procedure is outside your comfort level, have a DJI-authorized service technician handle it — the part is inexpensive next to the airframe.

What if I order the wrong part?

Contact us. Unused parts in original condition are returnable. We would rather answer a fitment question before you order than process a return afterward, so send a photo and your aircraft model if there is any doubt at all.

Do you stock other parts for this aircraft?

Yes. Ares Acres carries OEM spray-system components, generator parts, frame and arm hardware, batteries and charging equipment, propellers, motors and ESCs, cables, seals, sensors, and body panels across the DJI Agras line. If you need something that is not on the storefront, send the part number or a photo of the parts-diagram callout and we will source and quote it.

A nozzle still drips after I fitted a new spring. What did I miss?

Almost always the seat or the ball rather than the spring. A new spring restores the push, but it cannot close a leak path. Open the valve again and check three things: a groove or cut ring on the seat, a dull band or flat spot on the ball, and debris that found its way back in during reassembly. Also confirm the spring sits squarely on its shoulder rather than cocked against the bore wall, which seats the ball off center no matter how strong the spring is.

Can I stretch a tired spring to get through the week?

No, and it is worth being blunt about it. Stretching takes the wire past its elastic limit, changes the rate, and gives you a spring that feels stronger between your fingers and then takes a fresh permanent set within a few pressure cycles. You end up back where you started, over a field, with a valve whose behavior you can no longer predict. The same goes for pliers: a nicked coil is where the next break starts.

The spring came out in pieces. Do I need to account for every fragment?

Yes. A broken coil section is loose metal in a wetted line and it goes wherever the flow takes it: under the ball where it props the valve open, into the seat where it cuts a groove, or downstream into the next restriction. Lay the pieces out and satisfy yourself the spring is whole before closing the valve. If a fragment is missing, flush that leg with clean water and check the strainer before the aircraft goes back to work.

How do I tell a corroded spring from one that is just stained by tank mix?

Rinse it in clean water, dry it, and look in good light with the coils held apart. Staining sits on the surface and looks even along the wire. Corrosion is localized: dark pits, a rough or fuzzy texture, a spot where the wire looks thinner or the surface has broken up. Roll it between your fingers. Anything you can feel as roughness is where that spring will eventually break.

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